[Bug rtl-optimization/87780] [9 regression] ICE error: unrecognizable insn

[romain.geissler at amadeus dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87780

--- Comment #5 from Romain Geissler <romain.geissler at amadeus dot com> ---
Hi,

Trying with today's trunk with this patch included, my clang PGO+LTO bootstrap
goes further, but then the generated clang fails to compile itself. Just
putting here the clang error for reference:

fatal error: error in backend: Cannot select: 0x20c13f8: ch = fp_to_fp16
0x201f1d8, 0x20bccd8, FrameIndex:i64<0>
  0x20bccd8: f80,ch = CopyFromReg 0x201f1d8, Register:f80 %0
    0x20bcc08: f80 = Register %0
  0x20c1bb0: i64 = FrameIndex<0>
In function: __divtc3
clang-7: error: clang frontend command failed with exit code 70 (use -v to see
invocation)

The only thing that I changed recently is binutils/gcc/glibc, not the clang
sources. So there might still have some code gen issue left in gcc trunk (which
I don't know how to investigate).

Cheers,
Romain